MCQ
Which of the Phosphorus oxoacid can create silver mirror from $AgNO _3$ solution ?
- A$\left( HPO _3\right)_{ n }$
- ✓$H _4 P _2 O _5$
- C$H _4 P _2 O _6$
- D$H _4 P _2 O _7$

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$(I)$ $C_6H_5-CH-Br$
$(II)$ $\begin{array}{*{20}{c}}
{{C_6}{H_5} - CH - {C_2}{H_5}} \\
{|\,\,\,} \\
{Br}
\end{array}$
